As the liver is open to the eyes, the normal vision of the eyes is mainly nourished by liver blood in order to function properly. If you use your eyes excessively for a long period of time, you will damage the liver and blood, which will lead to liver blood deficiency. According to this theory, when the body has long vision injury blood, you can take appropriate oral medicine to nourish the liver and blood to regulate, you can take Siwu Tang plus reduction or Liu Wei Di Huang Wan, Qiju Di Huang Wan, etc. for regulation and treatment. In addition, usually eat more food containing vitamin A, such as fruits, vegetables, egg yolk and other foods, have a very good effect on vision.